Millions of data or more, modern databases are very clever while handling large amount of data either ways. Its more about how do you want to retrieve this data, for what purposes, how do you display this data in UI etc. If you make your choices in the Domain model smartly and make good choices in the UI/UX then you should not have any issues in "playing with millions of data"
Define your usecase more by editing the question. that way community can help better